Refereeing in Different Systems Posted by Randy Vogt on Sep. 5, 5:37 p.m.The youngest youth soccer players start out by kicking a smaller ball into a smaller goal on a small-sided field. By the time they have graduated to U-13 and often sooner, they are playing 11 vs. 11 with a No. 5 ball on a regulation field with goals that are 8 feet high and 8 yards wide.» 4 Comments